Flectrical measuring instrument



Jan. 22, 1929; 7

A. CALLSEN ELECTRICAL MEASURING INSTRUMENT Filed July 17. 1926 R O T f my M nY B M NESSES:

ATT RNE'Y Patented Jan. 1 32, 1329.

U l gTA Th1 S ALBERT CALLSEN, 07:"

TRIC o; MANUFACTURING COMPANY,

NURIEMFBEBG, GERIl-EANY, ASSIGNOR TO WESTINGHOUSE ELEC- CORPORATION OF PENNSYLVANIA.

ELECTRICAL MEASURING INSTRUMENT.

application filed my 17, 1926, Serial No My invention relates to electrical measuring instrun'ients and particularly to instruments that operate on the induction principle.

One of the objects of my invention is to provide means whereby instruments of the type above specified may be caused to operate in a more. accurate and uniform manner.

Another object of my invention is to proio vide simple and practical mechanical means for adjusting such irregular magneticproperties of shunt members for instruments of the HlI)VG-l11(ll1t8(l character as may be incident to quantity manufacture.

The core members of induction meters are usually provided with shunt members of such form and location that substantially all of the mganctic flux ofthe current Winding, in excess of a predetermined quantity, shall be deflected through the armature disc. The torque of the armature is thereby increased at relatively great loads, thus overcoming the faulty operation caused by damping.

Shunt members, to operate in the manner explained above, must have quite definite magnetic properties. These properties, While predeterminable, are hard to approach in quantity manufacture. Any variation in the shape or amount of material in the shunt members causes a corresponding variation in their magnetic properties.

' In practicing my invention, I provide i'neans or adjusting; the magnetic properties of the shunt members after they are manufactured. I first reduce the cross-section of the shunt member, by slotting, to ensure the dcsi red condition of saturation. I then mount adj ustable magnctizable pieces on the shunt member in such places that the conductivity of the flux path may be increased or diminished, as desired.

Figure 1 of the accompanying drawings is a side view of a portion of a meter structure embodying my invention,

Fi g. 2 is a front view of the Fig. l,

Fig. 3 is a front View of a shunt embodying a modification of my invention, I

' Fig. 4. is a side view of the device shown in Fig. 5 is a view, similar modification, and

Fig. 6 is a front view of Fig. 5.

A. currentcoil structure shown in to Fig. 1, of another the parts shown in core 1 is provided with a 123,187, and in Germany August a, 1925.

member 2 mounted on a structural memberthat constitutes a part of a return flux path for a voltage-coil core 4.

armature 5 rotates between the voltagecoil core st and the shunt member 2. The desired condition of saturation is obtained by providing shunt member 2 with slots 8 and 9.

magnetizable shunt member 2 thus provide parallel magnetic paths of adjustable reluctance. By moving the members 10. the effect of the magnetic shunt member 2 may be varied.

In Figs. 3 and 4 pivoted of bridging the slots 8 to adjust the reluctance.

In Figs. 5 and 6 magnetic members 14 are connected with each other by a non-magnetic member 15 that is held in position by a screw 16 projectingthrough a slot 17. The mag nct-ic members 14 may be moved more or less into the air tance of the shunt member 2.

Heretofore, it has been impossible to adjust the magnetic shunt member except by dismounting the same, and expensive machining and labor were necessary to properly proportion its magnetic properties. In practicing my invention, I eliminate these disadvantages and improve the accuracy of the meter thereby. Another feature of my invention is a means whereby the magnetic shunt may be adjusted readily at any time before or after the meter assembly and even when the meter is in service, if necessary.

l'Vhilc I have shown my invention as embodied in a specific magnetic shunt, any form of magnetic shunt for correcting the faulty operation of a meter may have its magnetic ux varied according to my invention, without departing from the spirit and scope thereof, as set forth. in the appended claims.

I claim as my invention: v

1. In an induction meter, the combination with a magnetizable shunt member having a slot, of means comprising a magnetizable member adj ustably mounted on the said memher for bridging said slot whereby. magnetic properties of the shunt member may be changed.

2. In an induction meter, the combination with a slotted magnetizable shunt member, of mechanical means comprising a plurality of gaps to vary the magnetic re-luc-.

magnetizable members mounted on the said shunt member and cooperating with the slots in said member whereby magnetic properties of the shunt member may be adjusted.

3. In an induction meter, the combination with a slotted magnetizable shunt member, of mechanical means comprising a non-magnetizable member, a plurality of magnetizable members mounted thereon an movable relatively to the slots in said shunt member, whereby irregular magnetic properties of the shunt member incident to quantity manufacture may be compensated for.

i. In an induction meter, the combination with a magnetizable shunt member, of means dividing the magnetizable shunt member into flux paths of different permeability, and means cooperating with said paths whereby irregular properties of said shunt member incident to quantity manufacture may be compensated for. t In testimony whereof, I have hereunto subscribed my name at Hamburg this 15th day of June 1926. I

ALBERT CALLSEN. 

